<template>
  <div class="player"
       v-show="playList.length>0">
    <transition name="normal"
                @enter="enter"
                @after-enter="afterEnter"
                @leave="leave"
                @after-leave="afterLeave">
      <div class="normal-player"
           v-show="fullScreen">
        <div class="background">
          <img :src="currentSong.image"
               width="100%"
               height="100%" />
        </div>
        <div class="top">
          <div class="back"
               @click="back"><i class="icon-back"></i></div>
          <h1 class="title"
              v-html="currentSong.name"></h1>
          <h2 class="subtitle"
              v-html="currentSong.singer"></h2>
        </div>
        <div class="middle"
             @touchstart="middleTouchStart"
             @touchmove="middleTouchMove"
             @touchend="middleTouchEnd">
          <div class="middle-l"
               ref='middleL'>
            <div class="cd-wrapper"
                 ref="cdWrapper">
              <div class="cd"
                   :class="cdRotate">
                <img class="image"
                     :src="currentSong.image" />
              </div>
            </div>
            <div class='playing-lyric-wrapper'>
              <div class='playing-lyric'>{{playingLyric}}</div>
            </div>
          </div>
          <scroll class="middle-r"
                  ref="lyricList"
                  :data="currentLyric && currentLyric.lines">
            <div class="lyric-wrapper">
              <div v-if="currentLyric">
                <p ref="lyricLine"
                   class="text"
                   :class="{'current':currentLineNum === index}"
                   v-for="(line,index) in currentLyric.lines"
                   :key="index">
                  {{ line.txt }}
                </p>
              </div>
            </div>
          </scroll>
        </div>
        <div class="bottom">
          <div class="dot-wrapper">
            <span class="dot"
                  :class="{'active':currentShow==='cd'}"></span>
            <span class="dot"
                  :class="{'active':currentShow==='lyric'}"></span>
          </div>
          <div class="progress-wrapper">
            <span class="time time-l">{{ format(currentTime) }}</span>
            <div class="progress-bar-wrapper">
              <progress-bar :percent="percent"
                            @percentChange="onProgressBarChange"></progress-bar>
            </div>
            <span class="time time-r">{{ format(currentSong.duration) }}</span>
          </div>
          <div class="operators">
            <div class="icon i-left"
                 @click="changeMode">
              <i :class="iconMode"></i>
            </div>
            <div class="icon i-left"
                 :class="disableCls">
              <i class="icon-prev"
                 @click="prev"></i>
            </div>
            <div class="icon i-center"
                 :class="disableCls">
              <i :class="playIcon"
                 @click="togglePlaying"></i>
            </div>
            <div class="icon i-right"
                 :class="disableCls">
              <i class="icon-next"
                 @click="next"></i>
            </div>
            <div class="icon i-right">
              <i @click='toggleFavorite(currentSong)'
                 :class="getFavoriteIcon(currentSong)"></i></div>
          </div>
        </div>
      </div>
    </transition>
    <transition class="mini">
      <div class="mini-player"
           v-show="!fullScreen"
           @click="open">
        <div class="icon">
          <img :class="cdRotate"
               width="40"
               height="40"
               :src="currentSong.image" />
        </div>
        <div class="text">
          <h2 class="name"
              v-html="currentSong.name"></h2>
          <p class="desc"
             v-html="currentSong.singer"></p>
        </div>
        <div class="control">
          <progress-circle :radius="radius"
                           :percent="percent">
            <i :class="miniIcon"
               @click.stop.prevent="togglePlaying"
               class="icon-mini"></i>
          </progress-circle>
        </div>
        <div class="control"
             @click.stop='showPlaylist'><i class="icon-playlist"></i></div>
      </div>
    </transition>
    <playlist ref='playlist'></playlist>
    <audio ref="audio"
           :src="currentSong.url"
           @play="ready"
           @error="error"
           @timeupdate="updateTime"
           @ended="SongEnd"></audio>
  </div>
</template>

<script>
import { mapGetters, mapMutations, mapActions } from 'vuex'
import animations from 'create-keyframe-animation'
import { prefixStyle } from 'common/js/dom'
import ProgressBar from 'base/progress-bar/progress-bar'
import ProgressCircle from 'base/progress-circle/progress-circle'
import { playMode } from 'common/js/config'
import Lyric from 'lyric-parser'
import Scroll from 'base/scroll/scroll'
import Playlist from 'components/playlist/playlist'
import { playerMixin } from 'common/js/mixin'

const transform = prefixStyle('transform')
const transitionDuration = prefixStyle('transitionDuration')
export default {
  name: 'Player',
  mixins: [playerMixin],
  data () {
    return {
      songReady: false,
      currentTime: 0,
      radius: 32, // 圆形进度条长宽
      currentLyric: null,
      currentLineNum: 0,
      currentShow: 'cd',
      playingLyric: ''
    }
  },
  created () {
    this.touch = {}
  },
  computed: {
    cdRotate () {
      return this.playing ? 'play' : 'play pause'
    },
    miniIcon () {
      return this.playing ? 'icon-pause-mini' : 'icon-play-mini'
    },
    playIcon () {
      return this.playing ? 'icon-pause' : 'icon-play'
    },
    disableCls () {
      return this.songReady ? '' : 'disable'
    },
    percent () {
      return this.currentTime / this.currentSong.duration
    },
    ...mapGetters([
      'fullScreen',
      'playing',
      'currentIndex'
    ])
  },
  methods: {
    back () {
      this.setFullScreen(false)
    },
    open () {
      this.setFullScreen(true)
    },
    enter (el, done) {
      const { x, y, scale } = this._getPosAndScale()

      let animation = {
        0: {
          transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
        },
        60: {
          transform: `translate3d(0,0,0) scale(1.1)`
        },
        100: {
          transform: `translate3d(0,0,0) scale(1)`
        }
      }
      animations.registerAnimation({
        name: 'move',
        animation,
        presets: {
          duration: 400,
          easing: 'linear'
        }
      })
      animations.runAnimation(this.$refs.cdWrapper, 'move', done)
    },
    afterEnter () {
      animations.unregisterAnimation('move')
      this.$refs.cdWrapper.style.animation = ''
    },
    leave (el, done) {
      this.$refs.cdWrapper.style.transition = 'all 0.4s'
      const { x, y, scale } = this._getPosAndScale()
      this.$refs.cdWrapper.style[transform] = `translate3d(${x}px,${y}px,0) scale(${scale})`
      this.$refs.cdWrapper.addEventListener('transitionend', done)
    },
    afterLeave () {
      this.$refs.cdWrapper.style.transition = ''
      this.$refs.cdWrapper.style[transform] = ''
    },
    togglePlaying () {
      if (!this.songReady) {
        return
      }
      if (this.currentLyric) {
        this.currentLyric.togglePlay()
      }
      this.$nextTick(() => {
        this.setPlayingState(!this.playing)
      })
    },
    SongEnd () {
      if (this.mode === playMode.loop) {
        this.loop()
      } else {
        this.next()
      }
    },
    loop () {
      this.$refs.audio.currentTime = 0
      this.$refs.audio.play()
      if (this.currentLyric) {
        this.currentLyric.seek(0)
      }
    },
    prev () {
      if (!this.songReady) {
        return
      }
      if (this.playList.length === 1) {
        this.loop()
        return
      } else {
        let index = this.currentIndex - 1
        if (index === -1) {
          index = this.playList.length - 1
        }
        this.setCurrentIndex(index)
      }
      this.songReady = false
    },
    next () {
      if (!this.songReady) {
        return
      }
      if (this.playList.length === 1) {
        this.loop()
        return
      } else {
        let index = this.currentIndex + 1
        if (index === this.playList.length) {
          index = 0
        }
        this.setCurrentIndex(index)
        if (!this.playing) {
          this.togglePlaying()
        }
      }
      this.songReady = false
    },
    ready () {
      this.songReady = true
      this.savePlayHistory(this.currentSong)
    },
    error () {
      this.songReady = true
    },
    updateTime (e) {
      this.currentTime = e.target.currentTime
    },
    format (interval) {
      // 时间戳处理
      interval = interval | 0
      const minute = (interval / 60) | 0
      const second = this._pad(interval % 60)
      return `${minute}:${second}`
    },
    getLyric () {
      this.currentSong.getLyric().then(lyric => {
        if (this.currentSong.lyric !== lyric) {
          return
        }
        this.currentLyric = new Lyric(lyric, this.handleLyric)
        if (this.playing) {
          this.currentLyric.play()
        }
      }).catch(() => {
        this.currentLyric = null
        this.playingLyric = ''
        this.currentLineNum = 0
      })
    },
    handleLyric ({ lineNum, txt }) {
      this.currentLineNum = lineNum
      if (lineNum > 5) {
        let lineEl = this.$refs.lyricLine[lineNum - 5]
        this.$refs.lyricList.scrollToElement(lineEl, 1000)
      } else {
        this.$refs.lyricList.scrollTo(0, 0, 1000)
      }
      this.playingLyric = txt
    },
    showPlaylist () { // 点击显示播放列表
      this.$refs.playlist.show()
    },
    middleTouchStart (e) {
      this.touch.initiated = true
      const touch = e.touches[0]
      this.touch.startX = touch.pageX
      this.touch.startY = touch.pageY
    },
    middleTouchMove (e) {
      if (!this.touch.initiated) {
        return
      }
      const touch = e.touches[0]
      const deltaX = touch.pageX - this.touch.startX
      const deltaY = touch.pageY - this.touch.startY
      if (Math.abs(deltaY) > Math.abs(deltaX)) {
        return
      }
      const left = this.currentShow === 'cd' ? 0 : -window.innerWidth
      const offsetWidth = Math.min(
        0,
        Math.max(-window.innerWidth, left + deltaX)
      )
      this.touch.percent = Math.abs(offsetWidth / window.innerWidth)
      this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
      this.$refs.lyricList.$el.style[transitionDuration] = '0'
      this.$refs.middleL.style.opacity = 1 - this.touch.percent
      this.$refs.middleL.style[transitionDuration] = '0'
    },
    middleTouchEnd () {
      let offsetWidth
      let opacity
      this.touch.initiated = false
      if (this.currentShow === 'cd') {
        if (this.touch.percent > 0.1) {
          offsetWidth = -window.innerWidth
          this.currentShow = 'lyric'
          opacity = 0
        } else {
          offsetWidth = 0
          opacity = 1
        }
      } else {
        if (this.touch.percent < 0.9) {
          offsetWidth = 0
          this.currentShow = 'cd'
          opacity = 1
        } else {
          offsetWidth = -window.innerWidth
          opacity = 0
        }
      }
      this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
      this.$refs.middleL.style.opacity = opacity

      this.$refs.lyricList.$el.style[transitionDuration] = '300ms'
      this.$refs.middleL.style[transitionDuration] = '300ms'
    },
    _pad (num, n = 2) {
      let len = num.toString().length
      while (len < n) {
        num = '0' + num
        len++
      }
      return num
    },
    _getPosAndScale () {
      const targetWidth = 40
      const paddingLeft = 40
      const paddingBottom = 30
      const paddingTop = 80
      const width = window.innerWidth * 0.8
      const scale = targetWidth / width
      const x = -(window.innerWidth / 2 - paddingLeft)
      const y = window.innerHeight - paddingTop - width / 2 - paddingBottom
      return { x, y, scale }
    },
    onProgressBarChange (percent) {
      const currentTime = this.currentSong.duration * percent
      this.$refs.audio.currentTime = currentTime
      if (!this.playing) {
        this.togglePlaying()
      }
      if (this.currentLyric) {
        this.currentLyric.seek(currentTime * 1000)
      }
    },
    ...mapMutations({
      setFullScreen: 'SET_FULL_SCREEN',
      setPlayingState: 'SET_PLAYING_STATE',
      setCurrentIndex: 'SET_CURRENT_INDEX',
      setPlayMode: 'SET_PLAY_MODE',
      setPlayList: 'SET_PLAYLIST'
    }),
    ...mapActions([
      'savePlayHistory'
    ])
  },
  watch: {
    currentSong (newSong, oldSong) {
      if (!newSong.id) { // 歌曲列表中无歌曲时不再播放
        return
      }
      // currentSong改变时播放歌曲
      if (newSong.id === oldSong.id) {
        return
      }
      if (this.currentLyric) {
        this.currentLyric.stop() // 停止上一首歌的lyric
        this.currentTime = 0
        this.playingLyric = ''
        this.currentLineNum = 0
      }
      clearTimeout(this.timer)
      this.timer = setTimeout(() => {
        this.$refs.audio.play()
        this.getLyric()
      }, 1000)
    },
    playing (newPlaying) {
      const audio = this.$refs.audio
      this.$nextTick(() => {
        newPlaying ? audio.play() : audio.pause()
      })
    }
  },
  components: {
    ProgressBar,
    ProgressCircle,
    Scroll,
    Playlist
  }
}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
@import '~common/stylus/variable'
@import '~common/stylus/mixin'
.player
  .normal-player
    position: fixed
    left: 0
    right: 0
    top: 0
    bottom: 0
    z-index: 150
    background: $color-background
    .background
      position: absolute
      left: 0
      top: 0
      width: 100%
      height: 100%
      z-index: -1
      opacity: 0.6
      filter: blur(20px)
    .top
      position: relative
      margin-bottom: 25px
      .back
        position: absolute
        top: 0
        left: 6px
        z-index: 50
        .icon-back
          display: block
          padding: 9px
          font-size: $font-size-large-x
          color: $color-theme
          transform: rotate(-90deg)
      .title
        width: 70%
        margin: 0 auto
        line-height: 40px
        text-align: center
        no-wrap()
        font-size: $font-size-large
        color: $color-text
      .subtitle
        line-height: 20px
        text-align: center
        font-size: $font-size-medium
        color: $color-text
    .middle
      position: fixed
      width: 100%
      top: 80px
      bottom: 170px
      white-space: nowrap
      font-size: 0
      .middle-l
        display: inline-block
        vertical-align: top
        position: relative
        width: 100%
        height: 0
        padding-top: 80%
        .cd-wrapper
          position: absolute
          left: 10%
          top: 0
          width: 80%
          height: 100%
          .cd
            width: 100%
            height: 100%
            box-sizing: border-box
            border: 10px solid rgba(255, 255, 255, 0.1)
            border-radius: 50%
            &.play
              animation: rotate 20s linear infinite
            &.pause
              animation-play-state: paused
            .image
              position: absolute
              left: 0
              top: 0
              width: 100%
              height: 100%
              border-radius: 50%
        .playing-lyric-wrapper
          width: 80%
          margin: 30px auto 0 auto
          overflow: hidden
          text-align: center
          .playing-lyric
            height: 20px
            line-height: 20px
            font-size: $font-size-medium
            color: $color-text-l
      .middle-r
        display: inline-block
        vertical-align: top
        width: 100%
        height: 100%
        overflow: hidden
        .lyric-wrapper
          width: 80%
          margin: 0 auto
          overflow: hidden
          text-align: center
          .text
            line-height: 32px
            color: $color-text-l
            font-size: $font-size-medium
            &.current
              color: $color-text
    .bottom
      position: absolute
      bottom: 50px
      width: 100%
      .dot-wrapper
        text-align: center
        font-size: 0
        .dot
          display: inline-block
          vertical-align: middle
          margin: 0 4px
          width: 8px
          height: 8px
          border-radius: 50%
          background: $color-text-l
          &.active
            width: 20px
            border-radius: 5px
            background: $color-text-ll
      .progress-wrapper
        display: flex
        align-items: center
        width: 80%
        margin: 0px auto
        padding: 10px 0
        .time
          color: $color-text
          font-size: $font-size-small
          flex: 0 0 30px
          line-height: 30px
          width: 30px
          &.time-l
            text-align: left
          &.time-r
            text-align: right
        .progress-bar-wrapper
          flex: 1
      .operators
        display: flex
        align-items: center
        .icon
          flex: 1
          color: $color-theme
          &.disable
            color: $color-theme-d
          i
            font-size: 30px
        .i-left
          text-align: center
        .i-center
          padding: 0 20px
          text-align: center
          i
            font-size: 40px
        .i-right
          text-align: left
        .icon-favorite
          color: $color-sub-theme
    &.normal-enter-active, &.normal-leave-active
      transition: all 0.4s
      .top, .bottom
        transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
    &.normal-enter, &.normal-leave-to
      opacity: 0
      .top
        transform: translate3d(0, -100px, 0)
      .bottom
        transform: translate3d(0, 100px, 0)
  .mini-player
    display: flex
    align-items: center
    position: fixed
    left: 0
    bottom: 0
    z-index: 180
    width: 100%
    height: 60px
    background: $color-highlight-background
    &.mini-enter-active, &.mini-leave-active
      transition: all 0.4s
    &.mini-enter, &.mini-leave-to
      opacity: 0
    .icon
      flex: 0 0 40px
      width: 40px
      padding: 0 10px 0 20px
      img
        border-radius: 50%
        &.play
          animation: rotate 10s linear infinite
        &.pause
          animation-play-state: paused
    .text
      display: flex
      flex-direction: column
      justify-content: center
      flex: 1
      line-height: 20px
      overflow: hidden
      .name
        margin-bottom: 2px
        no-wrap()
        font-size: $font-size-medium
        color: $color-text
      .desc
        no-wrap()
        font-size: $font-size-small
        color: $color-text-d
    .control
      flex: 0 0 30px
      width: 30px
      padding: 0 10px
      .icon-play-mini, .icon-pause-mini, .icon-playlist
        font-size: 30px
        color: $color-theme-d
      .icon-mini
        font-size: 32px
        position: absolute
        left: 0
        top: 0
@keyframes rotate
  0%
    transform: rotate(0)
  100%
    transform: rotate(360deg)
</style>
